Bgtagy pivoted hammeb



0.1. WILLIAMS.

ROARY PIVOTED HAMMER.

APPLICATION msn MAY 23. 1919.

Patented Out. 7, 1919.

OLIYERJ'. WILLIAMS, 0F BURLINGABIE, CALIFORNIA, ASSIGNOR T0 WILLIAMSPTENT CRUSHER t PULVEEIZER CO., OF ST. LOUIS, MISSOURI, A CORPORATION 0FMISSOURI.

ROTARY PIVOTED HAMMER.

Specification of Letters Patent.

Application 'led. May 28, 1919. Serial No. 300,237.

To all whom t may concern.'

Be it known that I, OLIVER J. WILLIAMS, a citizen of the United States,residing at Burlingame, in the county of San Mateo and StateoffC'alifornia, have invented ycertain new and useful Improvements inRotaryv Pivoted Hammers, of which the following is a specification.

This invention relates to certain new and useful improvements in rotary.pivoted hammers the'pejculiarities of which will be hereinafterdesbribed and claimed.

The main object of my invention isV to provide a rotary pivoted hammerespecially adapted for cutting fibrous material and shredding feed suchas alfalfa; another object is to provide such a cutting edge upon a wornout hammer of the style named hereafter and renew-the life of saidhammer. In the accompanying drawing on which like reference lettersindicate corresponding parts Figure l represents a vertical sectionalelevation across the shaft of a machine provided with my improvedhammers; Figq' an enlarged view of the operative cuttingend of such ahammer; Fig. 3 a view of Athe width or side face of such a hammer; Fig.4 an edge view of the same as it lies inthe plane of rotation; Fig. 5 adouble-ended rectangular bar hammer shown in face view or width, thelife of which itis desired to renew; and Fig. 6 an edge viewfcf thelatter hammer.

The lettere. designates the shaft of a ma# chineon which are mountedsuitable disks B carrying hammers C'by hammer rods D vlpassing throughsaid disks. The disks are cut out as shown, for the reception of thepivoted ends of the hammers which are thus mounted alternately incircular rows in the planes. of rotation. A suitable cage E cooperateswith the outer or operative ends of said hammers, and a suitable casingF incloses the cage and rotor above described.

These hammers consist of a dat rectangular bar of steel of considerablewidth as compared with the thickness, and such width is 2 inches forexample, while `the thickness or lesser dimension of the bar varies fromgth of an inch to Sth of an inch, according to the material lthat it isdesired to operate on. and shred or cut in said machine. This style ofhammer has near one end a hole G-for pivotal mounting on the hammer rodD, and at the other end is formed a recess H consisting of asemi-circular base to a triangular slot, the sides lI of which areformed by planes converging from the opposite ends of the base to theouter end or head of the hammer where they intersect at the axis Jthrough the shank and pivot center G.

Acute angles are thus formed which pro' vide oppositely directed cuttingedges K K that are substantially in the axial plane and are as long asthe shank is thick. Said cutting edges may therefore be reduced to a-llth of an inch when such is the thickness of the rectangular bar, vormay be th of an inch when such is the thickness of said bar. In order tomake said cutting edges op; erative in the reverse directions when. thehammer is reversed on its pivot so as to bring thev opposite edge to thefront, the divided head or prongs forming said head, are odset inopposite directions laterally as shown in Figs. 2 and 4r. rihe cuttingedge K therefore has cl'ear action upon the material when rotating inone direction, while the offset prong with its edge K has similarunobstructed action when the hammer is rotating in the oppositedirection,as would be the case when the hammers arereversely .mountedupon the hammer rods to bring the `other' cutting edge into action whenthe previous action of the first cutting edge has been diminished bywear.

It will be observed that the cutting edge K connects by the straightplane il with the semi-circular base of the recess H which thus servesas a clearance for the material being cut. The same opening acts as aclearance when the opposite cutting edge is in action as when reverselymounted. Theouter corners of the head are preferably rounded at L sothat the odset prongs are provided with clearance at the outer endsbetween the cutting edges and the cage E and constitute what is known inthe trade as an .deal point or cutting edge. It will be noted that onaccount of these cutting edges K-K being substantially in the radialline through the pivot of the hammer and the shaft A,

ratentea'oet. a, reis;

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- edges thus being formed upon a practically mon form of hammer is usedvwhich hammer is shown in'detail in lligs. 5 and 6. This hammer C ismade of a plain rectangular straight bar of steel of suitable length andhaving square ends provided near each end with a hole G-H adaptedalternately to form the pivotal point of support when mountedrespectively upon the hammer rod D. When this form of hammer has beenlworn oi at the corners as shown by dotted lines in Fig. 5,. and all fourcorners have been worn down by yreversing the hammer upon the rod D,th1s hammer is practically ,Worn out. It is another object of myinvention to renew the life of such a hammer by cutting a triangularportin from onepivot hole, such as H Fig. 5, to the adjacent end, andoffsetting the prongs of the divided head thus formed in opposite-directions so vthat it will form a recess and present the appearance ofthe hammer shown in Figs. 2, 3 and 4 previously described. Two newcutting wornout hammer, will renew its efectivo use and operation atslight expense by providing two cutting edges like those shown anddescribed above. l Y

Another function of the finished hammer as shown in this application, isthat therounded corner on the forward side edge of the hammer that waspreviously a square 'corner but now has beenworn down and in my improvedconstruction has been bent to one sideof the central plane of rotation,.will

-therefore the rounded edge .stillact but with a scrubbing eect upon thematerial in `the cage, while it will be followed up immediately by thecutting edge on the same hammer in the new form shown; and the cuttingedge both on the same her and both on the forward edge for the timebeing of the said hammer, act in conjunction and supplement one anotherby their rubbing and cutting effect practically simultaneously operatmg.

lit is understood that my form of hammer as above described may be madefrom -a blank of proper shape 1n the first instance without waitlng fora hammer of the style shown in Figs..5 and 6 to become worn out orbecome rounded on its edges before ehanging it to the style of hammershown in the previous figures and thereby renewing its life andeEect'iveness. Likewise a statement of dimensions is given for thepurpose of illustration and l sizes mentioned.

I claim:

l. A rotary pivoted hammer comprising a rectangular bar shank of agreater width than thickness having a hole near one end for pivotalmounting, and having a recess am not confined to the at near theopposite head end in the axis of said shank,-sa.id recess dividing thehead i end into two prongs, and said prongsbeing set. out laterally inopposite directionsfrom the plane of the width of the shank.

2. A rotary pivoted hammer comprising a rectangular bar shank of agreater width in the plane of rotation than thickness,

having a hole near one end through the lesser dimension of the bar forpivotal mounting,

and having a recess at the opposite head endv shaped like a semifcirclewith its two ends connected by substantially straight planes to the headend of the axis through the shank, formingl two prongs with acutecutting edges,-said prongs being o'set laterally in opposite directionsfrom the wide faces of` said shank and having reversible cutting whereofI have ailixed myv a dat bar shank having a head

